CFG_INTERFACE and CFG_CC3000 can't be enabled at same time

[microbuilder]

CFG_INTERFACE and CFG_CC3000 seem to have a config conflict and can't be enabled at the same time. This should be resolved so they can be used together.

See: http://www.microbuilder.eu/Forums/Thread/fe6bbd04-2132-496d-8cd4-e301456b1ecf.aspx